You can create PDFs from screen captures and other images you copy from an image editing application.
Use the method described for the operating system
running on your computer:(Windows) Capture a displayed image to the Clipboard, either by using the Copy command in an image-editing application, such as Adobe Photoshop, or by pressing the PrintScreen key. Then in Acrobat, choose File > Create PDF > From Clipboard Image, or choose From Clipboard Image in the Create PDF toolbar menu.
(Mac OS) Choose Acrobat > Services > Grab > [Screen, Selection, or Timed Screen]. (Grab is the Mac OS X screen-capture utility.) Your screen capture automatically converts to a PDF and opens.